tools arch: Sync arch/x86/lib/memcpy_64.S with the kernel

commit e883d09c9eb2ffddfd057c17e6a0cef446ec8c9b upstream.

Just a minor fix done in:

  Fixes: 26a37ab319a2 ("x86/mce: Fix copy/paste error in exception table entries")

Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/n/tip-ni9jzdd5yxlail6pq8cuexw2@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>